Results 221 to 230 of about 21,797 (258)
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Compensation of the contrast and brightness attenuation with depth in confocal microscopy
Proceedings of the 21st Spring Conference on Computer Graphics, 2005A confocal laser scanning microscope (CLSM) captures images from a biological specimen in different depths and provides one with a stack of precisely registered fluorescent images. However, image intensities suffer from light loss distortions showing contrast and brightness degradation of images with depth.
Martin Capek +3 more
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OCT skin image enhancement through attenuation compensation
Applied Optics, 2012The enhancement of optical coherence tomography (OCT) skin images can help dermatologists investigate the morphologic information of the images more effectively. In this paper, we propose an enhancement algorithm with the stages that includes speckle reduction, skin layer detection, and attenuation compensation.
Ali, Hojjatoleslami +1 more
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Improvement of quantification in SPECT studies by scatter and attenuation compensation
European Journal of Nuclear Medicine, 1989The filtered backprojection images obtained from classical SPECT studies are not adequate for evaluation of volumes or parameters of clinical interest. Noise, scattering, boundary accuracy and attenuation are the main problems of SPECT quantification. It is the aim of the following study to overcome these difficulties.
J, Mas, B, Ben Younes, R, Bidet
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Disturbance attenuation via strictly positive real compensators
Journal of the Franklin Institute, 2003The authors describe conditions for designing strictly positive real (SPR) compensators ensuring closed-loop \(H_\infty\) performance for a linear system. Due to their inherent robustness, SPR compensators are frequently used in aerospace applications (e.g., large flexible structures).
Kyung-Soo Kim, Faryar Jabbari
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Feedback compensation of the in-domain attenuation of inputs in diffusion processes
2013 American Control Conference, 2013This paper addresses the problem of compensating for the in-domain attenuation of inputs for a class of process control applications. Specific examples include the challenge of maintaining uniform temperatures or through-cure during thick-film radiative drying and curing processes in the face of the effective input's variation with film depth due to ...
Adamu Yebi, Beshah Ayalew
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Design of a Lead Compensator with Minemum Attenuation
International Journal of Electrical Engineering & Education, 1980This paper discusses a simple proof for the geometrical construction for the design of a phase lead compensator with minimum attenuation. Also, certain equations used in the proof are shown to be useful in the analytical determination of the attenuation factor and pole-zero locations of such a compensator.
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Inversion-Driven Attenuation Compensation Using Synchrosqueezing Transform
IEEE Geoscience and Remote Sensing Letters, 2018Attenuation is a fundamental mechanism as seismic wave propagates through the earth. The loss of high-frequency energy and concomitant phase distortion can be compensated by inverse ${Q}$ filtering to enhance the resolution of seismic data.
Guowei Zhang, Jinghuai Gao
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IEEE Transactions on Medical Imaging, 1988
Comparisons are made between different analytic attenuation compensation methods used in SPECT imaging. The methods include a multiplicative technique and a single-iterative technique, both applied after filtered backprojection, and two different implementations of an attenuation-weighted filtered backprojection technique (A-W FBP).
S H, Manglos +5 more
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Comparisons are made between different analytic attenuation compensation methods used in SPECT imaging. The methods include a multiplicative technique and a single-iterative technique, both applied after filtered backprojection, and two different implementations of an attenuation-weighted filtered backprojection technique (A-W FBP).
S H, Manglos +5 more
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Compensated Precision High-Voltage Attenuator
Review of Scientific Instruments, 1955A high-voltage divider consisting of twelve 2.5 megohm units enclosed by metal spinnings is modified to have good frequency response up to 200 kc. This is done by compensating for the capacity of the spinnings to ground by introducing an appropriate capacity from the spinnings to the high-voltage source.
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Inversion-based attenuation compensation with dip constraint
Petroleum Science, 2022Xiong Ma, Hao Li
exaly